LLVM can not produce a correct code for 254.gap. Therefore -O0 was
used for both LLVM and GCC for 254.gap.

The used machine is 3.4Ghz Intel Core i7-2600 with 8GB memory
under Fedora Core14.

GCC-4.6.1 was configured with
--enable-checking=release and was bootstrapped which
means that it was compiled by itself. LLVM-2.9 x86 binaries are taken from
LLVM download site.
All changes are given relative to LLVM-2.9 run with -O2 -mtune=generic.